Software for empirical analysis:

Stata (version 18.0) (Available at https://www.stata.com/)
Operating system: Windows 7 or later, macOS 10.12 or later, Linux kernel 2.6 or later.
Processor: 64-bit processor, Intel or AMD processor recommended, at least dual core.
Memory: At least 4GB of RAM. 8GB or higher recommended.
Storage: At least 20GB of available hard disk space recommended.
Display Resolution: At least 1024x768 recommended.
Graphics processor: discrete graphics card recommended.


Please refer to https://doi.org/10.7910/DVN/69NLNE for the code and regression results.

Econometric approaches and variables are introduced in the manuscript.